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Continental drift led to disappearance of a number of South American mammals because :

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there was an outbreak of a number of infectious diseases

sudden change in the climatic conditions

they were outcompeted by more highly evolved animals reaching here from North America

alteration of vegetation was not conducive to their survival

answer is C.

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Detailed Solution

Due to continental drift, when South America joined North America, South American animals were outcompeted by more highly evolved animals from North America.

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